Valve.



v No.ss1,191. I PATENTED MAR.1o,19oa.

' J. D. MAULAGHLAN.

' VALVE. l

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metal for the formation-of valve disks.

lbar of steel, an the head yUNITEDsrirrns PATENT OFFICE..

JOHN D. MACLACHLAN, OF DETROIT, MICHIGAN,"A SSIGNOR'TO' DETROIT-STEAMvENGINE COMPANY, OF DETROIT, MICHIGAN,l A CORPORATION OF MICHIGAN.

` VALVE.

No. 881, 191. Specification o To alljwhom it 'may concern: A

Be 1t known that I, JOHN D. MAoLAonLAN,

`acitizen of the United States of America, 4residing at Detroit, in thecounty of Wayne and State of Michigan, have invented certain new anduseful Improvements in Valves. of which the following is aspecification, reference being had therein' to the accompanying drawins. f

The invention relates to valves more particularly designed for use inengines.

It is the object of the inventionI to obtain a construction having acast metal head, and wrought -metal stem integrally united to eachother.

To this end, the invention consists in the peculiar construction ashereinafter set forth.

In the drawings, Figure 1 is a central longitudinal section through thevalve and stem. Figs. 2,-l3, '4, and ,5 show various modificatlons.

In the present state of the art, it has been found that cast'metal ispreferable to wrought n the other hand, the valve stems are better whereformed of wrought metal. Cast metal disks have been united to wroughtmetal stems by mechanicaljoints, but this necessitates machining theparts, and adds to the cost of the construction. With the presentinvention, a composite construction of cast disk and wrought stem isobtained, in which the parts are united without machining, so as to beincapable of displacement.

As shown in Fig. 1, A is the stem and B the head, or disk of thevalve.The stem A is formed of wrou ht metal, referably around is united to thestem by being cast thereupon. Disengagement between the parts isprevented by an interlocking joint, which, in Fig."1 is formed by cuttinthe grooves a. in the stem, `which are lled y the castmetal. The otherend of the stem pro'ects slightly beyond the disk, and is provide withanv end cross'slot b for .the engagement of-a screw driver or othertool, by which the valve may be rotated to bring it to its-seat.

In casting `a head B about the stem, the opllration may be performed soas to either l the casting in contact withthe stem, or

f Letters Patent.

n 4Application led April 23, 1906, Serial No. 313,283, v

Patented 10, 1908.

mold so that a considerable quantity o the molten metal is caused toilow by the stem,

Vto burn it on, that is, by constructin the before solidifying. In thelatter case, the

metal of the stem is raised to approximately the tem erature of themolten metal before it solid' es, with the result that the metal is notchilled. When the parts are united in either way. above mentioned, theunion is such that a head cannot be displaced without.:

breaking.

In Figs. 2, 3, 4, 'and 5, otherA means for` l' uniting the cast andwrought metals from that shownl in Fig. 1 are illustrated. I'n v2 thestem is bored with one or more apertures c, preferably two bores atright an'gles to each other. This will permit the `cast metal to formkeys passing through the stem. In Fig. 3, pins are inserted in bores inthe stem, and project out beyond the same, so as to be embedded in theca st metal.

In Fig. 4, the other end of the `vstem` is.y threaded, and the metalcast thereabout,

Where the cast metal is burned" upon the stem, it will remain soft, soas to permit of machining. Furthermore, this process integrates the twoVmetals by fusion together of the contacting surfaces. Thus, the partsbeing in molecular contact, there is' .no danger of loosening throughvibration, as is the case Where the joint is a mechanical one.

What I claim as my invention is:

1. A valve comprising an integrated cast metal head and wrought metalstem.

2. A valve comprising a cast metal head on which the valveface isformed, and va Wrought metal stem, said head being cast upon saidstemand integrated therewith, and being in an unchilled condition.

3. A valve comprising a stem of wrought met'al, a head cast thereaboutand integral therewith the end of said stem, projecting said stem, so asto iill said grooves, and surrounding the intermediate portion of thelarger diameter, said head being integral with said stem.

5.- A Valve comprising a stem of wrought -5 metal," and a head eastthereabout and "bur-ned thereupon substantially as and for the purposedescribed. 6. A valve comprising a steni of Wrought gm lnetal having aportion thereof fashioned to increase the surface, and a cast metal head10' surrounding said fashioned portion and integrated therewith.

In testimony whereof I affix my signature in presence of two witnesses.

JOHN D. MAOLACHLAN.

Witnesses :r`

JAMES P. BARRY, EDWARD A. COBB.

